P0138

Technical Definition:

O2 Circuit High Voltage (Bank 1, Sensor 2)

Trouble Code: P0138
Address: 0x0138
System: Powertrain
Subsystem:
Technical Description:

The Heated Oxygen Sensor (2) located rear of catalytic converter produces an output signal relative to oxygen storage capacity of catalytic converter.

Possible Causes:
  • Faulty O2 sensor
  • Short to battery voltage in O2 sensor signal circuit
  • High fuel pressure

Possible Symptoms:

O2 Sensor Circuit High Voltage Bank 1 Sensor 2

Possible Solutions:
  • Replace O2 sensor
  • Repair short to battery voltage in o2 sensor signal circuit

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty Rear Heated Oxygen Sensor Bank 1
– Rear Heated Oxygen Sensor Bank 1 harness is open or shorted
– Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection
– Intake air leaks
– Exhaust gas leaks
– Inappropriate fuel pressure
– Faulty fuel injectors

Specific Makes:

– High Fuel Consumption
– Excessive Smoke from Exhaust

Leave a Reply

Your email address will not be published.